There is one weapon that I myself could never have the heart to design. A weapon that our Airforce, sadly, is trying to develope. Although it's still not even in the embryonic stage. An antimatter bomb. It is believed that if you fill a bomb the size of a grenade with antimatter, it could destroy an entire nation. Luckily, they believe they wont even have enough antimatter to make it for another 70 years, and even then, it can only be stored for so long before the antimatter breaks down. It's like one antimatter researcher said: "I think we should get off this planet, because I'm afraid we're going to destroy it".